Who is often called as Hindu Luther of north India?

Raja Ram Mohan Roy is often referred to as the "Hindu Luther of North India." He was a prominent social and religious reformer in the 19th century who played a crucial role in modernizing Indian society by advocating for the abolition of practices like sati, promoting education, and emphasizing rationalism in religion. His efforts laid the groundwork for the Brahmo Samaj and inspired subsequent reform movements in India.